NCG080649_2021 DMR_20210309

Semi-annual Stormwater Discharge Monitoring Report
for North Carolina Division of Energy, Mineral and Land Resources General Permit No. NCG080000
Date submitted 3/2/2021
CERTIFICATE OF COVERAGE NO. NCG08 0 6 4 9
FACILITY NAME Durham Maintenance Complex, Durham City Transit, First Transit
COUNTY Durham
PERSON COLLECTING SAMPLES Parker Alvis
LABORATORY ENCO laboratories Lab Cert. # 591
Comments on sample collection or analysis:
SAMPLE COLLECTION YEAR 2021
SAMPLE PERIOD ❑■ Jan -June ❑ July -Dec
or ❑ Monthly'
on th
DISCHARGING TO CLASS ❑ORW ❑HQW ❑Trout ❑PNA
❑Zero -flow ❑Water Supply ❑SA
❑Other
PLEASE REMEMBER TO SIGN ON THE REVERSE 4
Did this facility perform Vehicle Maintenance Activities using more than 55 gallons of new oil per month? ❑■ yes ❑ no (if yes, complete Part A)
Part A: Vehicle & Equipment Maintenance Areas Monitoring Requirements (If applicable) ❑ No discharge this period'
Outfall No.
Date Sample Collected'
(mo/dd/yr)
24-hour rainfall amount,
Inches'
Non -Polar Oil & Grease
mg/L
Total Suspended Solids,
mg/L
New Motor or Hydraulic Oil Usage,
gal/mon
Benchmarks
-
-
15
100 or 504
-
Parameter Code
-
46529
00552
C0530
NCOIL
Outfall- 01
02/18/2021
0.1
8.63
17
300
Outfall- 02
02/18/2021
0.1
12.3
14
' Monthly sampling (instead of semi-annual) must begin with the second consecutive benchmark exceedance for the same parameter at the same outfall.
' For sampling periods with no discharge at any single outfall, you must still submit this discharge monitoring report with a checkmark here.
3The total precipitation must be recorded using data from an on -site rain gauge. Unattended sites may be eligible for a waiver of the rain gauge requirement.
4 See General Permit text, Table 1, identifying the especially sensitive receiving water classifications where the more protective benchmark applies.
Note: Results must be reported in numerical format. For example, do not report Below Detection Limit, BDL, <PQL, Non -detect, ND, or other similar non -
numerical format. When results are below the applicable limits, they must be reported in the format. "<XX me/L", where XX is the numerical value of the
detection limit, reporting limit, etc. in mg/L. Conversely, where fecal coliform results exceed the dilution upper limit, report the result as ">XX".
Permit Date: 11/1/2018-5/31/2021 SWU-248, last revised 11/1/2018
Page 1 of 2

Part B: Oil/water Separators and Secondary Containment Areas at Petroleum Bulk Stations and Terminals (If applicable) ❑ No discharge this period'
Outfall
No.
Date Sample
Collected'
(mo/dd/yr)
24-hour rainfall
amount,
Inches3
Sample Collected'
mo/dd/yr
Total Suspended
Solids,
mg/L
pH,
Standard units
Non -Polar Oil &
Grease,
mg/L
Permit Limit
_
-
-
100 or 501
6.0 — 9.0
15
Parameter Code
-
46529
-
C0530
00400
00552
Footnotes from Part A also apply to this Part B
Note: If you report a sample value in excess of the benchmark, you must implement Tier 1, Tier 2, or Tier 3 responses. See General Permit text.
FOR PART AAND PART B MONITORING RESULTS:
• A BENCHMARK EXCEEDANCE TRIGGERSTIER 1 REQUIREMENTS. SEE PERMIT PART II SECTION B.
• 2 EXCEEDANCES IN A ROW FOR THE SAME PARAMETER AT THE SAME OUTFALL TRIGGER TIER 2 REQUIREMENTS. SEE PERMIT PART II SECTION B.
• TIER 3: HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES FOR THE SAME PARAMETER AT ANYONE OUTFALL? YES ❑ NO ❑
IF YES, HAVE YOU CONTACTED THE DEMLR REGIONAL OFFICE? YES ❑ NO ❑
REGIONAL OFFICE CONTACT NAME:
Mail an oriainal coav of this DMR. includina all "No Discharae" resorts. within 30 days of receiat of the lab results for at end of monitorina period in the
case of "No Discharge" reports) to:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"I certify, under penalty of law, that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to
assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or
those persons direcVrespoBible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I
am aware that therficant penalties for submitting false information, including the possibility of fines and imprisonment for knowing violations."
Signature of Permitte Date
Permit Date: 11/1/2018-5/31/2021 SWU-248, last revised 11/1/2018
Page 2 of 2

TNI
ENCO Laboratories
Accurate. Timely. Responsive. Innovative.
102-A Woodwinds Industrial Court
Cary NC, 27511
Phone: [phone] FAX: [phone]
Tuesday, March 2, 2021
EI Group, Inc. (TH005)
Attn: Parker Alvis
2101 Gateway Center Blvd., Suite 200
Morrisville, NC 27560
RE: Laboratory Results for
Project Number: [none], Project Name/Desc: DATA-DCTC
ENCO Workorder(s): CE00762
Dear Parker Alvis,
Enclosed is a copy of your laboratory report for test samples received by our laboratory on
Thursday, February 18, 2021.
Unless otherwise noted in an attached project narrative, all samples were received in
acceptable condition and processed in accordance with the referenced methods/procedures.
Results for these procedures apply only to the samples as submitted.
The analytical results contained in this report are in compliance with NELAC standards, except
as noted in the project narrative if applicable. This report shall not be reproduced except in
full, without the written approval of the Laboratory.
This report contains only those analyses performed by Environmental Conservation
Laboratories. Unless otherwise noted, all analyses were performed at ENCO Cary. Data from
outside organizations will be reported under separate cover.
If you have any questions or require further information, please do not hesitate to contact me.
Sincerely,
A40
Bill Scott
Project Manager
Enclosure(s)
FINAL This report relates only to the sample as received by the laboratory, and may only be reproduced in full. I Page 1 of 7

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SAMPLE SUMMARY/LABORATORY CHRONICLE
Client ID: Outfall #1
Lab ID: CE00762-01
Sampled: 02/18/21 11:20
Received: 02/18/21 13:28
Parameter
Preparation
Hold Date/Time(s)
Prep Date/Time(s)
Analysis Date/Time(s)
EPA 1664B
EPA 1664B
03/18/21
02/24/21 08:30
02/24/21 14:11
SM 254OD-2011
NO PREP
02/25/21
02/20/21 09:45
02/20/21 09:45
SM 4500H+B-2011
NO PREP
02/18/21 11:34
02/24/21 08:23
02/24/21 08:23
Client ID: Outfall #2
Lab ID: CE00762-02
Sampled: 02/18/21 11:25
Received: 02/18/21 13:28
Parameter
Preparation
Hold Date/Time(s)
Prep Date/Time(s)
Analysis Date/Time(s)
EPA 1664B
EPA 1664B
03/18/21
02/24/21 08:30
02/24/21 14:11
SM 254OD-2011
NO PREP
02/25/21
02/20/21 09:45
02/20/21 09:45
SM 4500H+B-2011
NO PREP
02/18/21 11:39
02/24/21 08:23
02/24/21 08:23
FINAL This report relates only to the sample as received by the laboratory, and may only be reproduced in full. I Page 2 Of 7

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SAMPLE DETECTION SUMMARY
Client ID: Outfall #1
Lab ID:
CE00762-01
Analvte
Results
Flag MDL
2
Units
Method
Notes
Oil & Grease (HEM)
8.63
1.50
5.00
mg/L
EPA 1664B
pH
7.3
1.0
1.0
pH
SM 4500H+B-2011
Q-01
Temperature for pH (deg. C)
22
pH
SM 4500H+B-2011
Q-01
Total Suspended Solids
17
4.1
4.1
mg/L
SM 254OD-2011
Client ID: Outfall #2
Lab ID:
CE00762-02
Analvte
Results
Flag MDL
2
Units
Method
Notes
Oil & Grease (HEM)
12.3
1.50
5.00
mg/L
EPA 1664B
pH
7.0
1.0
1.0
pH
SM 4500H+B-2011
Q-01
Temperature for pH (deg. C)
Total Suspended Solids
22 pH
14 4.7 4.7 mg/L
SM 4500H+B-2011 Q-01
SM 254OD-2011
FINAL This report relates only to the sample as received by the laboratory, and may only be reproduced in full. I Page 3 Of 7

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ANALYTICAL RESULTS
Description: Outfall #1 Lab Sample ID:CE00762-01 Received: 02/18/21 13:28
Matrix: Water Sampled: 02/18/21 11:20 Work Order: CE00762
Project: DATA-DCTC Sampled By: Casey Gilleland
Classical Chemistry Parameters
I
^ - ENCO Cary certified analyte [NC 591]
Analyte rCAS Numberl Results Flao
Units
DF
MOIL
Q
Batch
Method
Analyzed
By
Notes
pH^ 7.3
pH
1
1.0
1.0
11324002
SM 4500H+B-2011
02/24/21 08:23
ZGW
Q-01
Temperature for pH (deg. C) 22
pH
1
11324002
SM 4500H+B-2011
02/24/21 08:23
ZGW
Q-01
Total Suspended Solids^ 17
mg/L
1.64
4.1
4.1
11320005
SM 254OD-2011
02/20/21 09:45
ZGW
Classical Chemistry Parameters
^ - ENCO Jacksonw1le certified analyte [NC 442]
Analyte rCAS Numberl Results Flao
Units
DF
MOIL
Q
Batch
Method
Analyzed
By
Notes
Oil &Grease (HEM) [C-0007]^ 8.63
mg/1-
1
1.50
5.00
11324001
EPA 1664B
02/24/21 14:11
LTS
Description: Outfall #2 Lab Sample ID:CE00762-02 Received: 02/18/21 13:28
Matrix: Water Sampled: 02/18/21 11:25 Work Order: CE00762
Project: DATA-DCTC Sampled By: Casey Gilleland
Classical Chemistry Parameters
I
^ - ENCO Cary certified analyte [NC 591]
Analyte rCAS Numberl Results Flao
Units
DF
MOIL
Q
Batch
Method
Analyzed
By
Notes
pH^ 7.0
pH
1
1.0
1.0
11324002
SM 4500H+B-2011
02/24/21 08:23
ZGW
Q-01
Temperature for pH (deg. C) 22
pH
1
11324002
SM 4500H+B-2011
02/24/21 08:23
ZGW
Q-01
Total Suspended Solids^ 14
mg/L
1.89
4.7
4.7
11320005
SM 254OD-2011
02/20/21 09:45
ZGW
Classical Chemistry Parameters
^ - ENCO Jacksonw1le certified analyte [NC 442]
Analyte rCAS Numberl Results Flao
Units
DF
MOIL
Q
Batch
Method
Analyzed
By
Notes
Oil & Grease (HEM) [C-0007]^ 12.3
mg/L
1
1.50
5.00
11324001
EPA 1664B
02/24/21 14:11
LTS
FINAL This report relates only to the sample as received by the laboratory, and may only be reproduced in full. I Page 4 Of 7

QUALITY CONTROL DATA
Classical Chemistry Parameters - Quality Control
Batch IB20005 - NO PREP
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Blank (1B20005-BLKI) Prepared & Analyzed: 02/20/2021 09:45
Spike Source %REC RPD
Anala Result Flag Q Units Level Result %REC Limits RPD Limit Notes
Total Suspended Solids 2.5 U 2.5 mg/L
LCS (1B20005-BSI) Prepared & Analyzed: 02/20/2021 09:45
Spike Source %REC
RPD
Analvte
Result Flag
Q
Units
Level Result %REC Limits
RPD Limit Notes
Total Suspended Solids
100
2.5
mg/L
100 101 80-120
Duplicate (1B20005-DUPI)
Prepared & Analyzed: 02/20/2021 09:45
Source: CE01447-01
Spike Source %REC
RPD
Analvte
Result Flag
Q
Units
Level Result %REC Limits
RPD Limit Notes
Total Suspended Solids
88
25
mg/L
99
12 20
Batch 1B24002 - NO PREP
LCS (1B24002-BSI) Prepared & Analyzed: 02/24/2021 08:23
Spike
Source
%REC
RPD
Analvte
Result Flag
2
Units
Level
Result
%REC Limits
RPD Limit Notes
pH
7.0
1.0
pH
7.00
100 99-101
Duplicate (1B24002-DUP1)
Prepared & Analyzed: 02/24/2021 08:23
Source: CD19532-01
Spike
Source
%REC
RPD
Analvte
Result Flag
Q
Units
Level
Result
%REC Limits
RPD Limit Notes
pH
7.4
1.0
pH
7.3
2 25
Classical Chemistry Parameters - Quality Control
Batch IB24001 - EPA 1664E
Blank (1B24001-BLKI)
Prepared: 02/24/2021 08:30 Analyzed: 02/24/2021 14:11
Spike Source %REC
RPD
Analvte
Result
Flag
Q
Units
Level Result %REC Limits RPD
Limit Notes
Oil & Grease (HEM)
1.50
U
5.00
mg/L
LCS (1B24001-BSI)
Prepared: 02/24/2021 08:30 Analyzed: 02/24/2021 14:11
Spike Source %REC
RPD
Analvte
Result
Flag
Q
Units
Level Result %REC Limits RPD
Limit Notes
Oil & Grease (HEM)
147
5.00
mg/L
160 92 78-114
LCS Dup (1B24001-BSDI)
Prepared: 02/24/2021 08:30 Analyzed: 02/24/2021 14:11
Spike Source %REC
RPD
Anala
Result
Flag
Q
Units
Level Result %REC Limits RPD
Limit Notes
Oil & Grease (HEM)
143
5.00
mg/L
158 91 78-114 3
18
Matrix Spike (1B24001-MSI)
Prepared: 02/24/2021 08:30 Analyzed: 02/24/2021 14:11
Source: CE00762-02
Spike Source %REC
RPD
Anala
Result
Flag
Q
Units
Level Result %REC Limits RPD
Limit Notes
Oil & Grease (HEM)
149
5.00
mg/L
161 12.3 85 78-114
FINAL
This report relates only to the sample as
received by the
laboratory, and may only be reproduced in full.
Page 5 Of 7

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FLAGS/NOTES AND DEFINITIONS
B The analyte was detected in the associated method blank.
D The sample was analyzed at dilution.
J The reported value is between the laboratory method detection limit (MDL) and the laboratory method
reporting limit (MRL), adjusted for actual sample preparation data and moisture content, where applicable.
U The analyte was analyzed for but not detected to the level shown, adjusted for actual sample preparation
data and moisture content, where applicable.
E The concentration indicated for this analyte is an estimated value above the calibration range of the
instrument. This value is considered an estimate.
MRL Method Reporting Limit. The MRL is roughly equivalent to the practical quantitation limit (PQL) and is
based on the low point of the calibration curve, when applicable, sample preparation factor, dilution
factor, and, in the case of soil samples, moisture content.
PQL PQL: Practical Quantitation Limit. The PQL presented is the laboratory MRL.
N The analysis indicates the presence of an analyte for which there is presumptive evidence (85% or greater
confidence) to make a "tentative identification".
P Greater than 25% concentration difference was observed between the primary and secondary GC column.
The lower concentration is reported.
[CALC] Calculated analyte - MDL/MRL reported to the highest reporting limit of the component analyses.
Q-01 Analysis performed outside of method - specified holding time.
FINAL This report relates only to the sample as received by the laboratory, and may only be reproduced in full. I Page 6 of 7

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Page 7 of 7